On Mar 16, 2009, at 1:09 PM, Zaphod Beeblebrox wrote:
On Sun, Mar 15, 2009 at 6:39 PM, Pegasus Mc Cleaft
<[email protected]>wrote:
Hi Adrian,
I am not sure, but I didnt think ZFS 13 was ever going to be
merged into
7-stable. I thought the kernel memory requirements were to great
(just going
back in my memory on that one). Also, I think there are still a few
bugs
left with the zil being enabled (and/or prefetch) causing lockups
on machine
with a lot of IO. I know I have hit that bug a few times on my
machine when
using various torrent clients when they want to preallocate large
amounts of
diskspace.
I personally cant wait until a later version of ZFS is imported that
supports encryption. I can finally say good-bye to our GEOM ELI USB
drives
for backups!! Never the less, I am quite thankfull to thoes
involved in
porting V13 to FreeBSD. Its a wonderfull improvement and my FS of
choice
when installing on new machines (especially zfs boot)
I think that you're touching on two entirely separate points here...
What it
takes to upgrade ZFS in -STABLE and what it takes to bring ZFS
modules in to
FreeBSD.
I sincerely hope that ZFSv13 is planned for -STABLE. Last we left
this
issue, testing and a few kernel improvements were in the way. None
of the
kernel improvements were going to change the API, so the project was
doable
in -STABLE. That said, time marches on, 8.0-RELEASE draws ever
nearer.
When we were still several years out on 8.0 and ZFS was causing me
more
problems, I was much more keen to push for the port. I would still
welcome
it with open arms, but I'm not convinced that anyone is going to
push it
forward.
The issue of encryption (along with many other issues) is tied to the
ability of FreeBSD to compile and use ZFS modules. Just like netgraph
modules extend the function of netgraph.ko and geom modules extend
the base
geom function, ZFS is designed (in Solaris, at least) to take
modules. ZFS
encryption is a module. I'm not clear on compression --- it would
make
sense that it is a module, but it seemingly got copied into FreeBSD
as a
core feature (and it may also be so in solaris).
Anyways... is there any plans to allow for ZFS modules in FreeBSD?
AFAIK ZFS v13 requires changes to the kernel that would break the ABI,
which is not allowed to change in a STABLE branch. With 8.0 coming
within the next 6 months, I doubt that 7 will see a new version of ZFS.
There are no problems running ZFS v13 with zil and prefetch enabled
and I have not had any predictable out of kernel memory panics. For
me, ZFS on CURRENT really is *that* much better.
Also, OpenSolaris has yet to integrate ZFS on disk encryption into
their source. The code is currently under review: http://opensolaris.org/os/project/zfs-crypto/
. OpenSolaris uses ZFS v14 now and on disk encryption will probably
be synced to a newer version of ZFS, meaning that this would require
another code sync with OpenSolaris.
Chris
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